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Thread: Low TA of 70 but still get fast rise of PH to 8.0

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    Low TA of 70 but still get fast rise of PH to 8.0

    Test results
    FC= 7
    TA=70
    PH= 8.0
    CYA= 50
    CH= 300

    2 days ago I added MA because my PH was high. That brought it down to 7.1, and a TA of 90. I checked today and my PH is already up to 8.0 but my TA dropped to 70.

    That doesnt make sense to me. My PH seems to always rise, and thats with NO use of the pool, no aeration except for the one jet my pool has. It rained lightly for about 15 mins last night, but I thought that would lower PH.

    Im kind of confused.
    Last edited by sfumato; 04-29-2016 at 09:51 AM. Reason: Fixed CH level to most recent.
    3,500 gal, in-ground, exposed aggregate, Hayward Maxflo Sp2807x-10 1Hp pump and Hayward Star-Clear C12002 filter. Chlorine liquid.

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    Mod Squad JVTrain's Avatar
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    Re: Low TA of 70 but still get fast rise of PH to 8.0

    It's OK to allow your TA to drop a little bit lower. Keep maintaining your pH at let the TA get down to 60 and see if it's better. Keep in mind that it's OK for your pH to get up to 7.8 or so and stay there if it's stable. If you attempt to maintain a pH of 7.4 or 7.6 at all times, you'll end up on the acid/baking soda hamster wheel. However, check your CSI at this lower TA. I suspect that with your low range CH, your CSI may be too low at a TA of 60 ppm. Adding a bit of CH would help with that.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Low TA of 70 but still get fast rise of PH to 8.0

    Quote Originally Posted by JVTrain View Post
    I suspect that with your low range CH, your CSI may be too low at a TA of 60 ppm. Adding a bit of CH would help with that.
    I was wondering about that. My CH actually seems to jump around a bit, may have something to do with my location being in Central FL. I have a test from 4/19 saying it was 235, and most recently on 4/26 a CH= 300.
    3,500 gal, in-ground, exposed aggregate, Hayward Maxflo Sp2807x-10 1Hp pump and Hayward Star-Clear C12002 filter. Chlorine liquid.

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    Mod Squad JVTrain's Avatar
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    Re: Low TA of 70 but still get fast rise of PH to 8.0

    With the quantity of rain that you get in Florida, your CH is likely to drop over time, if the rainfall outpaces evaporation rates and you have water going out an overflow. Rain water has very little CH so if you get a series of large rain events that is overflowing your pool, your CH will drop. When you don't get rain and you're refilling due to evaporation your CH will go up. Unless of course your fill water is very low in CH, which I doubt based on the soil types that are typical in FL.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Low TA of 70 but still get fast rise of PH to 8.0

    Could part of my issue be the size of my pool. I need to edit my sig. I "think" its actually 3500 gallons. Its kidney shaped so Ive been working on nailing down the actual size.

    What I do know is that I was able to raise my PH from 6.9 to 7.3 with only a couple hours by turning my jet up so that the water bubbled.
    3,500 gal, in-ground, exposed aggregate, Hayward Maxflo Sp2807x-10 1Hp pump and Hayward Star-Clear C12002 filter. Chlorine liquid.

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    Mod Squad tim5055's Avatar
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    Re: Low TA of 70 but still get fast rise of PH to 8.0

    You don't list a test kit in your signature. Are you self testing or letting the pool $tore do it for you?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Low TA of 70 but still get fast rise of PH to 8.0

    Quote Originally Posted by tim5055 View Post
    You don't list a test kit in your signature. Are you self testing or letting the pool $tore do it for you?
    Testing myself , I have the Taylor test kit.
    3,500 gal, in-ground, exposed aggregate, Hayward Maxflo Sp2807x-10 1Hp pump and Hayward Star-Clear C12002 filter. Chlorine liquid.

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    Re: Low TA of 70 but still get fast rise of PH to 8.0

    Quote Originally Posted by sfumato View Post
    Could part of my issue be the size of my pool. I need to edit my sig. I "think" its actually 3500 gallons. Its kidney shaped so Ive been working on nailing down the actual size.

    What I do know is that I was able to raise my PH from 6.9 to 7.3 with only a couple hours by turning my jet up so that the water bubbled.
    3500 is tiny, what is the length, width and average depth?
    36' x 18' 20k in ground, Finest Finish grey plaster, Pentair Tagelus 100D sand filter, Hayward Northstar 2hp pump, Jandy LRZ125EN heater, spill over spa, iaqualink controlled automation, Stenner chlorination, natural rock and flagstone coping, 1" glass mosaic waterline tile, SR Smith Vortex slide.

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    Re: Low TA of 70 but still get fast rise of PH to 8.0

    Just to update, and for the benefit of others who may have this problem, I think I figured out why PH was rising. When I was back at my pump I turned it off manually and felt water hit my foot. I looked down at pump and noticed a small crack going across the strainer cover. I turned it back on and went to check my jet and sure enough it had air blowing out of it. Stuck a piece of tape across the crack, vented the filter, checked the jet and no more air.

    I then ordered replacement part for $24, should be here next week, for now the duck tape fix is working.
    3,500 gal, in-ground, exposed aggregate, Hayward Maxflo Sp2807x-10 1Hp pump and Hayward Star-Clear C12002 filter. Chlorine liquid.

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